Rotary Drum Dryer with Apertured Shell and Zoned Plenum
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Solution Overview
Problem
Conventional drying systems for polymer crumb materials have a large footprint, high power consumption, and maintenance costs, and are inefficient in removing the remaining moisture content to below 0.5%, requiring additional equipment and extended processing times.
Innovation Solution
A rotary drum dryer with an apertured drum and a plenum divided by separator plates, using multiple drying air inlet nozzles to supply controlled temperature and pressure air for efficient drying, along with adjustable flight and flipper configurations to advance the material, and features for reduced maintenance and cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional drying equipment (apron dryer, fluid bed vibratory conveyor, spiral elevator conveyor) is used to reduce moisture content to below 0.5%, then the polymer material can be dried to the required moisture level, but the plant footprint becomes large and power consumption increases
Solution Approach 1:
The patent combines multiple drying functions into a single rotary drum dryer unit. The rotary drum integrates material advancement, drying surface provision, and air distribution functions that were previously distributed across multiple separate pieces of equipment (apron dryer, fluid bed vibratory conveyor, spiral elevator conveyor), thereby reducing the overall plant footprint while achieving the same moisture reduction to below 0.5%.
Solution Approach 2:
The rotary drum dryer performs multiple functions simultaneously: it advances material through rotation, provides a drying surface for moisture removal, distributes drying air through apertures, and maintains material in loose crumb form. This multi-functionality eliminates the need for separate specialized equipment for each function, reducing space requirements while achieving effective drying.
2Manufacturing precision
If conventional drying equipment is used to reduce moisture content to below 0.5%, then the polymer material can be dried to the required moisture level, but power consumption and maintenance costs increase
Solution Approach 1:
The rotary drum dryer utilizes pneumatic principles by distributing drying air through apertures in the rotary drum and using air flow to enhance moisture removal efficiency. This pneumatic approach improves drying effectiveness per unit of energy input compared to conventional mechanical drying equipment, reducing overall power consumption while achieving moisture content below 0.5%.
3Manufacturing precision
If additional conventional drying equipment is added to the finishing line to achieve sufficient final drying time, then moisture content can be reduced to below 0.5%, but the plant footprint and equipment complexity increase
Solution Approach 1:
The patent consolidates the functions of multiple conventional drying equipment units (apron dryer, fluid bed vibratory conveyor, spiral elevator conveyor) into a single integrated rotary drum dryer. This merging reduces equipment complexity from multiple separate units to one unified system while maintaining the capability to achieve moisture content reduction to below 0.5% through coordinated material advancement and air distribution.
4Manufacturing precision
If conventional mechanical dewatering equipment is used to reduce water content from 70-90% to 10-20%, then initial dewatering is achieved, but additional drying equipment is still required to reach below 0.5% moisture
Solution Approach 1:
The rotary drum dryer provides continuous drying action that effectively completes the moisture removal process from the 10-20% range down to below 0.5%. The continuous rotation and constant air flow through apertures maintain uninterrupted drying, eliminating the need for additional discrete drying stages or equipment that would otherwise be required to bridge this final moisture removal gap.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The rotary drum dryer achieves efficient drying with a smaller footprint, reduced power consumption, lower maintenance costs, and easier cleaning, enabling effective moisture reduction to 0.5% while maintaining the polymer crumb in a loose form.
Implementation Method 1
Drying air is supplied a plurality of drying air inlet nozzles disposed along a shell of the rotary drum dryer and into a corresponding plurality of zones in a plenum disposed between an interior surface of the shell and an exterior surface of the rotary drum
Data Source
AI summary
A rotary drum dryer includes a shell, an apertured rotary drum disposed within the shell and positioned to define a plenum between an interior surface of the shell and an exterior surface of the rotary drum, the plenum being divided into a plurality of zones by at least one separator plate disposed in the shell, and a plurality of drying air inlet nozzles disposed along the shell, each of the plurality of drying air inlet nozzles being positioned to direct drying air into a corresponding one of the plurality of zones.